Oracle Clob ResultSet Type

Hi all, I am accessing the CLOB field in a table using the resultset of type ResultSet.TYPE_SCROLL_SENSITIVE. And this bean (simple bean no EJB) is accessed from a servlet. When there is a single client access for servlet, things are working fine. When I simulate a load condition at web tier by creating multiple client threads, the results become erratic and oracle.jdbc.driver.OracleDriver throws exception while scrolling through the resultset. Though I have fixed the problem by changing the resultset type, I would like to know the reasons behind it. Could anyone please clarify? Rgds Muthu